nighthawk

Open-source, local-first, cross-platform AI terminal autocomplete. The spiritual successor to Fig.

What is this?

Type a command, see gray ghost text with the completion. Press Tab to accept. No login, no telemetry, no cloud required. Works in any terminal, any shell.

Features

Inline ghost text via ANSI escapes — works in any terminal emulator
500+ CLI specs from the withfig/autocomplete community repo
Auto-parse --help for any CLI without a spec
History-based predictions — your most-used commands surface first
Full-token replacement — typo-aware (ccla → claude, not cclaude)
Zero config — works immediately with no API key, no login, no account
Cross-platform — macOS, Linux, Windows
Multi-shell — zsh, bash, fish, PowerShell
Local LLM support (coming soon) — AI completions that never leave your machine
BYOK cloud (coming soon) — bring your own API key for OpenAI, Anthropic, etc.

Architecture

Lightweight Rust daemon + thin shell plugins (~50 lines each). The daemon runs a tiered prediction cascade:

Tier	Latency	Source
0	<1ms	Shell history prefix matching
1	<1ms	Static CLI specs (withfig/autocomplete + --help parser)
2	~50ms	Local LLM (future)
3	~500ms	Cloud API, BYOK (future)

Status

Early development. Building in public.

Shell	Status
zsh	In progress
bash	Planned
fish	Planned
PowerShell	Planned
nushell	Planned

Platform	Status
macOS	In progress
Linux	In progress
Windows	Planned

License